/* The following code example is taken from the book
 * "C++ Templates - The Complete Guide"
 * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002
 *
 * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.
 */
#define FunctorParamSpec(N)                           \
        template<typename F>                          \
        class UsedFunctorParam<F, N> {                \
          public:                                     \
            typedef typename F::Param##N##T Type;     \
        }
//...
FunctorParamSpec(2);
FunctorParamSpec(3);
//...
FunctorParamSpec(20);

#undef FunctorParamSpec
